How to use installCoverageHooks method in Playwright Internal

Best JavaScript code snippet using playwright-internal

coverage.js

Source: coverage.js Github

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...80}81/​**82 * @param {string} browserName83 */​84function installCoverageHooks(browserName) {85 const {api, events} = apiForBrowser(browserName);86 const coverage = new Map();87 const uninstall = traceAPICoverage(coverage, api, events);88 return {coverage, uninstall};89}90class CoverageEnv {91 /​**92 * @param {string} browserName93 */​94 constructor(browserName) {95 this.browserName = browserName;96 }97 /​**98 * @param {import('folio').WorkerInfo} workerInfo99 */​100 async beforeAll(workerInfo) {101 this.coverage = installCoverageHooks(this.browserName);102 }103 /​**104 * @param {import('folio').WorkerInfo} workerInfo105 */​106 async afterAll(workerInfo) {107 const { coverage, uninstall } = this.coverage;108 uninstall();109 const coveragePath = path.join(__dirname, '..', 'coverage-report', workerInfo.workerIndex + '.json');110 const coverageJSON = Array.from(coverage.keys()).filter(key => coverage.get(key));111 await fs.promises.mkdir(path.dirname(coveragePath), { recursive: true });112 await fs.promises.writeFile(coveragePath, JSON.stringify(coverageJSON, undefined, 2), 'utf8');113 }114}115module.exports = {...

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checkCoverage.js

Source: checkCoverage.js Github

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...16const path = require('path');17const fs = require('fs');18const {installCoverageHooks} = require('./​coverage');19const browserName = process.argv[2] || 'chromium';20let api = new Set(installCoverageHooks(browserName).coverage.keys());21/​/​ coverage exceptions22if (browserName === 'chromium') {23 /​/​ Sometimes we already have a background page while launching, before adding a listener.24 api.delete('browserContext.emit("backgroundpage")');25}26if (browserName !== 'chromium') {27 /​/​ we don't have CDPSession in non-chromium browsers28 api.delete('browser.newBrowserCDPSession');29 api.delete('browser.startTracing');30 api.delete('browser.stopTracing');31 api.delete('browserContext.backgroundPages');32 api.delete('browserContext.serviceWorkers');33 api.delete('browserContext.newCDPSession');34 api.delete('browserContext.emit("backgroundpage")');...

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 installCoverageHooks(page);8 await page.coverage.startJSCoverage();9 const jsCoverage = await page.coverage.stopJSCoverage();10 console.log(jsCoverage);11 await browser.close();12})();13const { chromium } = require('playwright');14(async () => {15 const browser = await chromium.launch();16 const context = await browser.newContext();17 const page = await context.newPage();18 await page.coverage.startJSCoverage();19 const jsCoverage = await page.coverage.stopJSCoverage();20 console.log(jsCoverage);21 await browser.close();22})();23const { chromium } = require('playwright');24(async () => {25 const browser = await chromium.launch();26 const context = await browser.newContext();27 const page = await context.newPage();28 await page.coverage.startJSCoverage();29 const jsCoverage = await page.coverage.stopJSCoverage();30 console.log(jsCoverage);31 await browser.close();32})();33const { chromium } = require('playwright');34(async () => {35 const browser = await chromium.launch();36 const context = await browser.newContext();37 const page = await context.newPage();

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2const { chromium } = require('playwright-chromium');3const path = require('path');4(async () => {5 const browser = await chromium.launch();6 const context = await browser.newContext();7 installCoverageHooks(path.join(__dirname, 'coverage.json'), context);8 const page = await context.newPage();9 await page.close();10 await context.close();11 await browser.close();12})();13Now, we have to use the coverage file to generate the report. We will be using the [nyc](

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');2installCoverageHooks();3const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');4installCoverageHooks();5const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');6installCoverageHooks();7const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');8installCoverageHooks();9const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');10installCoverageHooks();11const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');12installCoverageHooks();13const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');14installCoverageHooks();15const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');16installCoverageHooks();17const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');18installCoverageHooks();19const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');20installCoverageHooks();21const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');22installCoverageHooks();23const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');24installCoverageHooks();25const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test/​coverage');26installCoverageHooks();27const { installCoverageHooks } = require('playwright/​lib/​server/​cjs/​test

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2installCoverageHooks();3const { chromium } = require('playwright');4(async () => {5 const browser = await chromium.launch();6 const context = await browser.newContext();7 const page = await context.newPage();8 await page.close();9 await context.close();10 await browser.close();11})();12const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');13installCoverageHooks();14const { chromium } = require('playwright');15(async () => {16 const browser = await chromium.launch();17 const context = await browser.newContext();18 const page = await context.newPage();19 await page.close();20 await context.close();21 await browser.close();22})();23const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');24installCoverageHooks();25const { chromium } = require('playwright');26(async () => {27 const browser = await chromium.launch();28 const context = await browser.newContext();29 const page = await context.newPage();30 await page.close();31 await context.close();32 await browser.close();33})();34const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');35installCoverageHooks();36const { chromium } = require('playwright');37(async () => {38 const browser = await chromium.launch();39 const context = await browser.newContext();40 const page = await context.newPage();41 await page.close();42 await context.close();43 await browser.close();44})();45const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');46installCoverageHooks();47const { chromium } = require('playwright

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2const { createTestServer } = require('playwright/​test');3const server = await createTestServer();4installCoverageHooks(server);5await server.listen(8080);6await page.coverage.startJSCoverage();7await page.coverage.stopJSCoverage();8await server.stop();9const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');10const { createTestServer } = require('playwright/​test');11const server = await createTestServer();12installCoverageHooks(server);13await server.listen(8080);14await page.coverage.startJSCoverage();15await page.coverage.stopJSCoverage();16await server.stop();17const { test, expect } = require('@playwright/​test');18test('Should generate coverage report for a file', async ({ page }) => {19 await page.coverage.startJSCoverage();20 await page.coverage.stopJSCoverage();21 const coverage = await page.coverage.stopJSCoverage();22 expect(coverage).toBeTruthy();23 expect(coverage.length).toBe(1);24 expect(coverage[0].text).toBeTruthy();25 expect(coverage[0].ranges.length).toBeGreaterThan(0);26});27const { test, expect } = require('@playwright/​test');28test('Should generate coverage report for a file', async ({ page }) => {29 await page.coverage.startJSCoverage();30 await page.coverage.stopJSCoverage();31 const coverage = await page.coverage.stopJSCoverage();32 expect(coverage).toBeTruthy();33 expect(coverage.length).toBe(1);

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Using AI Code Generation

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1const { installCoverageHooks } = require("@playwright/​test");2installCoverageHooks(globalThis);3const { coverage } = require("@playwright/​test");4const coverageObject = await coverage.startJSCoverage();5await coverage.stopJSCoverage(coverageObject);6module.exports = {7 {8 globalSetup: require.resolve("./​globalSetup.js"),9 },10};11const { chromium } = require("playwright");12module.exports = async () => {13 const browser = await chromium.launch();14 const context = await browser.newContext();15 globalThis.browser = browser;16 globalThis.context = context;17};18module.exports = async () => {19 await globalThis.context.close();20 await globalThis.browser.close();21};22{23 "scripts": {24 },25 "devDependencies": {26 }27}28const { coverage } = require("@playwright/​test");29const coverageObject = await coverage.startJSCoverage();30await coverage.stopJSCoverage(coverageObject);31const { coverage } = require("@playwright/​test");32const coverageObject = await coverage.startJSCoverage({33 {34 },35});36await coverage.stopJSCoverage(coverageObject);

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2installCoverageHooks();3const { chromium } = require('playwright');4const browser = await chromium.launch();5const { chromium } = require('playwright');6const browser = await chromium.launch();7const { chromium } = require('playwright');8const browser = await chromium.launch();9const { chromium } = require('playwright');10const browser = await chromium.launch();11const { chromium } = require('playwright');12const browser = await chromium.launch();13const { chromium } = require('playwright');14const browser = await chromium.launch();15const { chromium } = require('playwright');16const browser = await chromium.launch();17const { chromium } = require('playwright');18const browser = await chromium.launch();19const { chromium } = require('playwright');20const browser = await chromium.launch();21const { chromium } = require('playwright');22const browser = await chromium.launch();23const { chromium } = require('playwright');24const browser = await chromium.launch();25const { chromium } = require('playwright');26const browser = await chromium.launch();

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Using AI Code Generation

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1const { installCoverageHooks } = require('playwright/​lib/​server/​coverage');2installCoverageHooks();3const playwright = require('playwright');4const coverage = await globalThis.__coverage__;5fs.writeFileSync('coverage.json', JSON.stringify(coverage));6const browser = await playwright.chromium.launch();7const context = await browser.newContext();8const page = await context.newPage();9await page.coverage.startJSCoverage();10await page.coverage.stopJSCoverage();11await browser.close();12const { chromium } = require('playwright');13const fs = require('fs');14(async () => {15 const browser = await chromium.launch();

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StackOverFlow community discussions

Questions
Discussion

How to run a list of test suites in a single file concurrently in jest?

Running Playwright in Azure Function

Jest + Playwright - Test callbacks of event-based DOM library

firefox browser does not start in playwright

firefox browser does not start in playwright

Is it possible to get the selector from a locator object in playwright?

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.


Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});
https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

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